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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 5 |
| 3 | 55 |
| 4 | 969 |
| 5 | 23471 |
| 6 | 722893 |
| 7 | 27024719 |
| 8 | 1188673041 |
| 9 | 60146184799 |
| 10 | 3441880575621 |
| 11 | 219796618046831 |
| 12 | 15495685980169849 |
| 13 | 1195427487905706095 |
| 14 | 100171535560697901693 |
| 15 | 9060375019110233758111 |
| 16 | 879801446255000326901025 |
| 17 | 91290178606709678636278463 |
[1,1,5,55,969,23471,722893,27024719,1188673041, 60146184799,3441880575621,219796618046831, 15495685980169849,1195427487905706095, 100171535560697901693,9060375019110233758111, 879801446255000326901025, 91290178606709678636278463] |